Des Moines (United States) (AFP) - Plunging temperatures, whipping wind and buckets of snow derailed the final stretch of caucus campaigning in the US state of Iowa Friday as Republican presidential hopefuls delivered their last pitches to voters. Forecasters warned of "fairly intense blizzard conditions" throughout much of the Midwestern state, as the National Weather Service (NWS) said gusts of 50 to 55 miles (80 to 89 kilometers) per hour, paired with blowing snow, could reduce visibility down to a quarter of a mile. The extreme weather was making life difficult for White House hopefuls Ro...